Selecting-valve device.



W. V. TURNER SELECTING VALVE DEVICE. APPLICATION FILED MAR. I. 1913.

1,162,825, j I Patented M11915.

SATURATE'D 5754M FROM THROTTZ' l 8 7 2? WITNESSES INyEN'roR' W M If 57 wd pnirnn WALTER V. TURNER, OF EDGEWOOD, PENNSYLVANIA, ASSIGNOR T THE WESTING- Hoosn AIR BRAKE COMPANY, or or PENNSYLVANIA.

Specification of Letters Patent.

WILMERIDIN G, PENNSYLVANLLA, A CORPGRATION SELECTING-VALVE DEVICE.

Fatentcd Dec. 7, i915.

' 'Ap ncation filed m ch 1, 1913. Serial Np. 751,396.

To all whom it may concern:

'Be it known-that I, \VALTER V. TURNER, a citizen of the United States, residing at Edgewood, in the county of Allegheny and Statef'of Pennsylvania, have invented new and useful Improvements in Selecting-Valve Devices, ofwhich the following is a specification.

not been heated to the point at which the same is eiiective to superheat the steam. in "such case, it may be desirable to supply saturated steam directly to the engine cylinders, as the saturated steam would then be ofbetter quality than the steam passing through the superneater, owing to condensa tionin thesuperheater which tends to make the steam wet.

The principal object of my invention is provide meansby which either saturated. Lil superheated steam may be supplied to the engine cylinders according to the desire oi the engineer.

In the accompanying drawing, Figure 1 is a central sectional view of a selecting valve device embodying my invention, showing the parts in position for supplying saturated steam to the engine cylinders and Fig, 2 a similar View showing the parts in position for supplying superheated steam to the cylinders. a

The construction shown in the drawipg comprises a casing 1 having a piston chamber containing-a piston 2 and a cylindrical.

valve chamber containing a double piston valve having piston heads 3 and 4: carried by the valve stem 5, connected to'piston 2. The

chamber 6 formed by and intermediate/the piston 2 and the piston head 4 is iii open communication with a passage 7 leading to the pipe 8 which is connected to the usual locomotive steam throttle. The movement of the piston heads 3 and 4 controls 'communication to passages 9 and 10 connected respectively to pipell from the superheater and pipe 12 leading to the engine cylinders. The piston 2 controls a passage 13 connected to pipe 14 leading to the superheater.

A manually operated plug cook 15 in the casing 1 is provided with a port 16 adapted.

n one position to connect a passage 17 lead mg tosaturated. steam passage 7 with a passagelS opening into chamber 19 at the right of piston 2- and in another position said port is adapted to connect a passage openmg into chamber 19 with an atmospheric exhaust :ssage 21.

' desired to supply saturates steam ne cylinders, the cock 15 is turned ition shown in Fig. i, so that when I the steam throttle is opened to start the locomotive, saturated steam is admitted to the pipe 8 and flows through passage 17, port 16, and passage 18 to chamber 19. The chamber at the left of piston head 3 is open to an atmospheric exhaust port 222, so that while saturated steam is also supplied to chamber 6 intermediate the piston 2 and piston head 4, the opposing pressures acting on the piston device are unbalanced and the steam pressure in chamber 19 operates to piston device to the position shown n which the engine cylinder pasi0 18 rated steam supplied directly to the engine cylinders.

In thislposition the superheated steam passage13 is closed by the piston 2, so. supplied'to the that saturated steam is not superheater andthe same is therefore cut out of action. i

If it is desired to use superheated steam,

the cook 15 is turned to the position shown 2?, in which passage 20 is connected by port it w exhaust passage 21. The chamber 19 is thus vented to the atmosphere and when the steam throttle is openedsaturated steam. acting in chamber 6 exerts a difi'erential pressure on the piston device, due to the area of the piston 2 being greater than the area of the-piston head ,4, and in a direction to cause the piston device to be shifted to the position show'nin Fig. 2. In this position, the superheated steam passage 13 is open to chamber 6, so that saturated steam flows to the superheater and from the superheater the saturated steam floWs through pipe 11 and passage engine cylinder passage 10 ders instead of saturated steam.

en to chamber 6, so that satu-.

9 to thesspace,

intermediate the piston heads 3 and i. The being open 'in this positionto the above space, superheated, steam will be supplied to the engine cylinl A. feed groove 2-3 may he provided in the. 

